Agricultural land use shapes short and long‑term bacterial diversity, community structure, and assembly in biofilms of adjacent streams
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View abstract on PubMed
Summary
This summary is machine-generated.Intensive agriculture significantly alters stream biofilms, increasing bacterial diversity and favoring specific taxa. These changes, driven by nutrient runoff, can reshape biofilm development and function in aquatic ecosystems.
Area Of Science
- Microbial Ecology
- Environmental Science
- Freshwater Biology
Background
- Intensive agriculture increases nutrient and pesticide runoff into streams, impacting aquatic ecosystems.
- Freshwater biofilms are crucial microbial communities for nutrient cycling and bioremediation.
- Land use changes can alter biofilm microbial communities, potentially impairing ecosystem resilience.
Purpose Of The Study
- To compare bacterial communities in developing and mature biofilms from streams adjacent to different land uses (intensive agriculture, extensive grassland, forest).
- To assess the impact of agricultural land use on biofilm bacterial diversity, composition, and community assembly processes.
Main Methods
- 16S rRNA gene amplicon sequencing to analyze bacterial community composition.
- Diversity, differential abundance, community assembly, and co-occurrence network analyses were performed.
- Samples were collected from streams in Bavaria, Germany, with varying agricultural influences.
Main Results
- Intensive agriculture increased bacterial alpha diversity in both developing and mature biofilms.
- Land use shaped bacterial community composition, with deterministic processes dominating assembly, especially in developing biofilms.
- Key taxa like Arenimonas and Flavobacterium proliferated at agriculturally influenced sites, showing strong network connectivity.
Conclusions
- Agricultural land use profoundly impacts stream biofilm bacterial richness, composition, and assembly, particularly in developing biofilms under high anthropogenic impact.
- Nutrient inputs from agriculture can redirect biofilm development pathways.
- These alterations may change the ecological roles of biofilms in stream ecosystems.
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